Comment 9 for bug 112584

The bug is only partly solved with Gusty. In Feisty it persists completely.
I now report 2 different experiments:

1. using a commercial 9GB-DVD-ROM here which definitely contains UDF-extensions
    Gusty correctly automounts with udf.

    Feisty automounts with iso9660, here output from
    'cat /proc/mounts' -> /dev/scd0 /media/cdrom0 iso9660 ro,nosuid,nodev,noexec 0 0

    executing your proposed command 'mount /media/cdrom0' mounts iso9660:
    'cat /proc/mounts' -> /dev/scd0 /media/cdrom0 iso9660 ro,nosuid,nodev,noexec 0 0

    Manually I can mount the DVD-ROM as udf:
    root@pp:/home/ingo# mount -t udf /dev/sr0 /media/cdrom0
       mount: block device /dev/sr0 is write-protected, mounting read-only
    'cat /proc/mounts' -> /dev/sr0 /media/cdrom0 udf ro 0 0

2. I have got a DVD-R here, which contains files > 2GB, so it must use udf:
    This DVD-R does not automount at all, neither under Feisty, nor under Gusty
    It spins up twice after inserting, keeps spinning for a while, then stops without beeing mounted.
    No Icon showing up on the Desktop, device not listed in /proc/mounts

    executing your proposed command 'mount /media/cdrom0' mounts iso9660 without icon on desktop:
       mount: block device /dev/scd0 is write-protected, mounting read-only
    'cat /proc/mounts' -> /dev/scd0 /media/cdrom0 iso9660 ro,nosuid,nodev,noexec 0 0
    which definitely is wrong!

    Manually mounting using the '-t' option works fine:
    mount -t udf /dev/sr0 /media/cdrom0
       mount: block device /dev/sr0 is write-protected, mounting read-only
    'cat /proc/mounts' -> /dev/sr0 /media/cdrom0 udf ro 0 0
    and DVD-ROM is completely readable.

So, conclusion:
partly solved in Gusty (probably as long as filesize stays below 2GB), but still present in Feisty.
With filesize > 2GB (up to 4GB should be ok for UDF anyway), bug persists in Gusty and Feisty.

Ingo